/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerMode.h
Called by the outliner when a key is pressed
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnKeyDown ( const [FKeyEvent](API\Runtime\SlateCore\Input\FKeyEvent) & InKeyEvent )